I've seen the Mosquito Magnet a few years ago. They were showing how many mosquito's it had captured in just a few hours and it was pretty amazing. I haven't not tried one out yet due to the cost but we may purchase one for my wife's dad who lives in eastern Arkansas. They have tons of flooded rice fields and mosquitos that when they bite it feels more like a bee sting.

Sam's Club has one called a Power Trap Plus ($333) and it covers about an acre and half. If it works in Arkansas then it will work anywhere.